Teeth names are created by a combination of 4 different characteristics: 1  The jaw where they are located: upper and lower (alternatively the terms maxillary and mandibular can be used) 2  The side of the face: left and right.  The type of tooth: incisor, canine, premolar, and molar.
Vampire bats are members of the New World Leaf-nosed bats, the Phyllostomidae. All three species of living vampire bats occur in South and Central America. Fossils of three other species reveal that several thousand years ago vampire bats were more widespread.
The third theory proposes that the ancestors of vampire bats began to feed on insects and insect larvae they found in wounds on large animals. This theory notes that insectivorous bats often feed where there are many insects and some of them adjust their hunting style according to the situation.